CN205541585U - Fast thawing formula joule law experimental apparatus - Google Patents
Fast thawing formula joule law experimental apparatus Download PDFInfo
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- CN205541585U CN205541585U CN201620129344.7U CN201620129344U CN205541585U CN 205541585 U CN205541585 U CN 205541585U CN 201620129344 U CN201620129344 U CN 201620129344U CN 205541585 U CN205541585 U CN 205541585U
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- fast thawing
- electrothermal tube
- joule law
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Abstract
The utility model discloses a fast thawing formula joule law experimental apparatus, belong to teaching equipment field, constitute by electrothermal tube and fast thawing spare, the electrothermal tube is made to the coiling heating wire on resistant high temperature insulation pipe, and be connected the both ends of heating wire with binding post, tubulose or bar -shaped fast thawing spare are made to the solid material that uses the fusing point to be 38~200 degrees centigrade, arrange fast thawing spare in electrothermal tube, when the electrothermal tube has the current conveyance, the production of heat melts the back with fast thawing spare discharges from the export, the height that descends when observing fast thawing spare and melting what just can judge the size that the heating wire gives out heat, as long as make the electrothermal tube of different resistances, the different electric currents and different power -on time of rethread, just can accomplish whole projects of joule law experiment, it is visual good to have, the process that the student can direct perception heat produces, the experiment is done by suitable faculty and students.
Description
Technical field
This utility model relates to a kind of teaching equipment, is specifically related to a kind of fast thawing formula Joule Law Experiment device.
Background technology
It is known that Joule's law is to disclose electrical conductor to produce an important law of electrocaloric effect, expression formula is: Q=I2nullRt,Represent when conductor has electric current to pass through,Heat Q and the electric current I produced square is directly proportional,It is directly proportional to the size of conductor resistance R,It is directly proportional to the length of the time t of energising,In Middle School Physics teaching,Require that teacher is experimentally demonstrated to student and sees,In most of physics teaching materials,Describe only and with resistance wire, the kerosene in bottle or ethanol are heated,With thermometer display kerosene or the experimental technique of ethanol intensification speed,The shortcoming of this experimental technique is: heat time heating time is long,Heat up slow,Thermometer visual range is little,Seldom it is used,The experimental provision of the air during popular a kind of Resistant heating seals container on market,Chinese Patent Application No. is 201120267746.0 entitled Novel Joule law testers,It it is exactly typical one,Its operation principle is: when the air electrified regulation sealed in container,Air heats promotes the liquid level in U-tube to raise after expanding，With liquid level raise number indirectly judge heat number,The shortcoming of this experimental technique is: student can only be by the imagination,Resistance wire heating can allow air expansion,The liquid level in U-tube can be promoted after air expansion to raise,Student cannot perception heat effect,In place of Shortcomings.
Summary of the invention
In place of this utility model overcomes the deficiencies in the prior art, a kind of fast thawing formula Joule Law Experiment device is provided, it is made up of electrothermal tube and fast thawing part, fast thawing part is inserted in electrothermal tube, produce heat can be melted by fast thawing part when electrothermal tube is energized, and discharge from outlet, observe fast thawing part falling head number it is determined that produce heat number, use the electrothermal tube of different resistance values, change the size of electric current, change the length of conduction time, just can complete whole projects of Joule Law Experiment, it is visual good to have, student can the effect of directly perception heat effect, applicable Faculty and Students test.
The purpose of this utility model can be achieved through the following technical solutions；
A kind of fast thawing formula Joule Law Experiment device, it is made up of electrothermal tube and fast thawing part, on high-temperature insulation pipe, electrothermal tube made by coiling heating wire, and the two ends of heating wire are connected with binding post, make tubulose or bar-shaped fast thawing part with the solid material that fusing point is 38 ~ 200 degrees Celsius, fast thawing part is placed in electrothermal tube.
Electrothermal tube is provided with thermal-arrest metal tube, it is simple to assemble heat.
Electrothermal tube is provided with outlet, it is simple to the fast thawing part of fusing is discharged from outlet.
The resistance value size of heating wire differs, it is simple to select when doing different experiments.
Fusing point is that the solid material of 40 ~ 200 degrees Celsius uses wax, resin or plastics.
Fast thawing part side is provided with moveable graduated scale, it is simple to read the height that fast thawing part declines.
Electrothermal tube lower end is provided with the container accommodating fast thawing part, can accommodate the fast thawing part of discharge.
This utility model advantage compared with the existing technology is:
1 is visual good.
2 students can directly perception electrocaloric effect.
3 experimentations are short.
Accompanying drawing illustrates:
Fig. 1 is the generalized section of a kind of fast thawing formula Joule Law Experiment device;
Fig. 2 is the embodiment of waxed fast thawing formula Joule Law Experiment device;
Fig. 3 is the embodiment circuit diagram of waxed fast thawing formula Joule Law Experiment device;
Fig. 4 is the circuit diagram of three unit fast thawing formula Joule Law Experiment devices.
Detailed description of the invention:
Below in conjunction with detailed description of the invention and accompanying drawing, describe a kind of fast thawing formula Joule Law Experiment device of the present utility model in detail:
Fig. 1 is the generalized section of a kind of fast thawing formula Joule Law Experiment device:
In Fig. 1,0-5 is moveable graduated scale, and 6 is heating wire, and 7 is binding post, and 8 is container, and 9 is outlet, and 10 is high-temperature insulation pipe, and 11 is thermal-arrest metal tube, and 12 is fast thawing part;
Fig. 2 is the embodiment of waxed fast thawing formula Joule Law Experiment device:
In Fig. 2,0-5 is moveable graduated scale, and 7 is binding post, and 8 is container, and 9 is outlet, and 12 is fast thawing part, and 13 is brassboard, and 14 is electrothermal tube;
Fig. 3 is the circuit diagram of waxed fast thawing formula Joule Law Experiment device:
In Fig. 3, R1 and R2 is resistance, but resistance value is different, and U1 is power supply;
Fig. 4 is the circuit diagram of three unit fast thawing formula Joule Law Experiment devices:
In Fig. 4, R3, R4, R5 and R6 are resistance, and wherein, it is power supply that R3 equals to or more than R5, U2 more than R4, R4 equal to R5, R6;
nullEmbodiment at the waxed fast thawing formula Joule Law Experiment device of Fig. 2，In the embodiment circuit diagram of the waxed fast thawing formula Joule Law Experiment device of Fig. 3，Equipped with two unit fast thawing formula Joule Law Experiment devices on brassboard 13，This waxed fast thawing formula Joule Law Experiment device，Use waxed fast thawing part，The wax using fusing point to be 38-68 degree Celsius is raw material，By this waxed one-tenth tubulose or bar-shaped fast thawing part，Before starting experiment，First waxed fast thawing part 12 is inserted in electrothermal tube 14，Adjust moveable graduated scale 0-5，Align with the zero graduation of moveable graduated scale 0-5 in the top allowing waxed fast thawing part 12，And two electrothermal tubes 14 are connected into series connection，Resistance value R1 of the two electrothermal tube 14 is different with R2，After series connection, two binding posts 7 are connected on power supply U1，Electric current is had to pass through electrothermal tube 14 at once，Producing heat allows waxed fast thawing part 12 start fusing，Highly begin to decline，The wax of fusing is from outlet 9 discharge，Flow in container 8，Through 3-8 minutes，The falling head that can read two waxed fast thawing parts 12 from moveable graduated scale 0-5 differs，The decline that resistance value is bigger is more，Thus prove: under conditions of electric current is identical with the time，The heat of the biggest generation of resistance value is the most，In addition，Also can change resistance sizes，Change size of current，Change conduction time，Change connection in series-parallel connected mode，Just can complete whole projects of Joule Law Experiment.
In the circuit diagram of the three unit fast thawing formula Joule Law Experiment devices of Fig. 4, there are three unit, R3, R4, R5 and R6 is resistance, but only R3, R4, R5 tri-is the resistance of electrothermal tube, R6 is the outer meeting resistance being connected in parallel on R5, wax will not be melted by R6 adstante febre, wherein, R3 is more than R4, R4 is equal to R5, R6 equals to or more than R5, U2 is power supply, after power supply U2 connects, R3, R4, heat all can be produced on R5, owing to R3 is more than R4, they are series relationship, electric current is equal, the heat that the R3 that resistance value is big produces is more, thus prove: under conditions of electric current is identical with the time, the heat of the biggest generation of resistance value is the most.
Although R4 is equal to R5, but owing to the electric current on R5 is divided to walk a part by R6, making the electric current on R5 less than the electric current on R4, the heat that the R4 that electric current is bigger produces is more, thus proves: under conditions of resistance is identical with the time, the heat of the biggest generation of electric current is the most.
Time a few minutes to be spent is tested due to above, within this time a few minutes, it is observed that, the time heat of the longest generation is the most, so far, this three unit fast thawing formula Joule Law Experiment devices, as long as doing once-through operation experiment, just can complete whole projects of Joule Law Experiment, time-consuming.
Claims (7)
1. a fast thawing formula Joule Law Experiment device, it is made up of electrothermal tube and fast thawing part, it is characterized in that: on high-temperature insulation pipe, electrothermal tube made by coiling heating wire, and the two ends of heating wire are connected with binding post, make tubulose or bar-shaped fast thawing part with the solid material that fusing point is 38 ~ 200 degrees Celsius, fast thawing part is placed in electrothermal tube.
A kind of fast thawing formula Joule Law Experiment device the most according to claim 1, it is characterised in that: described electrothermal tube is provided with thermal-arrest metal tube.
A kind of fast thawing formula Joule Law Experiment device the most according to claim 1, it is characterised in that: described electrothermal tube is provided with outlet.
A kind of fast thawing formula Joule Law Experiment device the most according to claim 1, it is characterised in that: the resistance value size of described heating wire differs.
A kind of fast thawing formula Joule Law Experiment device the most according to claim 1, it is characterised in that: described fusing point is that the solid material of 38 ~ 200 degrees Celsius uses wax, resin or plastics.
A kind of fast thawing formula Joule Law Experiment device the most according to claim 1, it is characterised in that: described fast thawing part side is provided with moveable graduated scale.
7.
A kind of fast thawing formula Joule Law Experiment device according to claim 1, it is characterised in that: described electrothermal tube lower end is provided with the container accommodating fast thawing part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620129344.7U CN205541585U (en) | 2016-02-20 | 2016-02-20 | Fast thawing formula joule law experimental apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620129344.7U CN205541585U (en) | 2016-02-20 | 2016-02-20 | Fast thawing formula joule law experimental apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205541585U true CN205541585U (en) | 2016-08-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620129344.7U Expired - Fee Related CN205541585U (en) | 2016-02-20 | 2016-02-20 | Fast thawing formula joule law experimental apparatus |
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| Country | Link |
|---|---|
| CN (1) | CN205541585U (en) |
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2016
- 2016-02-20 CN CN201620129344.7U patent/CN205541585U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160831 Termination date: 20190220 |